package com.example.demo1;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Build;
import android.renderscript.RSRuntimeException;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.Transformation;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapResource;

public class BlurTransformation implements Transformation<Bitmap> {

	  private static int MAX_RADIUS = 25;
	  private static int DEFAULT_DOWN_SAMPLING = 1;

	  private Context mContext;
	  private BitmapPool mBitmapPool;

	  private int mRadius;
	  private int mSampling;

	  public BlurTransformation(Context context) {
	    this(context, Glide.get(context).getBitmapPool(), MAX_RADIUS, DEFAULT_DOWN_SAMPLING);
	  }

	  public BlurTransformation(Context context, BitmapPool pool) {
	    this(context, pool, MAX_RADIUS, DEFAULT_DOWN_SAMPLING);
	  }

	  public BlurTransformation(Context context, BitmapPool pool, int radius) {
	    this(context, pool, radius, DEFAULT_DOWN_SAMPLING);
	  }

	  public BlurTransformation(Context context, int radius) {
	    this(context, Glide.get(context).getBitmapPool(), radius, DEFAULT_DOWN_SAMPLING);
	  }

	  public BlurTransformation(Context context, int radius, int sampling) {
	    this(context, Glide.get(context).getBitmapPool(), radius, sampling);
	  }

	  public BlurTransformation(Context context, BitmapPool pool, int radius, int sampling) {
	    mContext = context.getApplicationContext();
	    mBitmapPool = pool;
	    mRadius = radius;
	    mSampling = sampling;
	  }

	  @Override
	  public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
	    Bitmap source = resource.get();

	    int width = source.getWidth();
	    int height = source.getHeight();
	    int scaledWidth = width / mSampling;
	    int scaledHeight = height / mSampling;

	    Bitmap bitmap = mBitmapPool.get(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
	    if (bitmap == null) {
	      bitmap = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);
	    }

	    Canvas canvas = new Canvas(bitmap);
	    canvas.scale(1 / (float) mSampling, 1 / (float) mSampling);
	    Paint paint = new Paint();
	    paint.setFlags(Paint.FILTER_BITMAP_FLAG);
	    canvas.drawBitmap(source, 0, 0, paint);

	    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
	      try {
	        bitmap = RSBlur.blur(mContext, bitmap, mRadius);
	      } catch (RSRuntimeException e) {
	        bitmap = FastBlur.blur(bitmap, mRadius, true);
	      }
	    } else {
	      bitmap = FastBlur.blur(bitmap, mRadius, true);
	    }

	    return BitmapResource.obtain(bitmap, mBitmapPool);
	  }

	  @Override public String getId() {
	    return "BlurTransformation(radius=" + mRadius + ", sampling=" + mSampling + ")";
	  }
	}
